/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the  "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id$
 */
package wx.xml.xalan.xalan.templates;

import javax.xml.transform.TransformerException;

import wx.xml.xalan.xalan.res.XSLTErrorResources;
import wx.xml.xalan.xalan.transformer.TransformerImpl;
import wx.xml.xalan.xml.dtm.DTM;

/**
 * Implement xsl:apply-imports.
 * <pre>
 * <!ELEMENT xsl:apply-imports EMPTY>
 * </pre>
 *
 * @xsl.usage advanced
 * @see <a href="http://www.w3.org/TR/xslt#apply-imports">apply-imports in XSLT Specification</a>
 */
public class ElemApplyImport extends ElemTemplateElement {
    static final long serialVersionUID = 3764728663373024038L;

    /**
     * Get an int constant identifying the type of element.
     *
     * @return Token ID for xsl:apply-imports element types
     * @see wx.xml.xalan.xalan.templates.Constants
     */
    public int getXSLToken() {
        return Constants.ELEMNAME_APPLY_IMPORTS;
    }

    /**
     * Return the node name.
     *
     * @return Element name
     */
    public String getNodeName() {
        return Constants.ELEMNAME_APPLY_IMPORTS_STRING;
    }

    /**
     * Execute the xsl:apply-imports transformation.
     *
     * @param transformer non-null reference to the the current transform-time state.
     * @throws TransformerException
     */
    public void execute(
        TransformerImpl transformer)
        throws TransformerException {

        if (transformer.currentTemplateRuleIsNull()) {
            transformer.getMsgMgr().error(this,
                XSLTErrorResources.ER_NO_APPLY_IMPORT_IN_FOR_EACH);  //"xsl:apply-imports not allowed in a xsl:for-each");
        }

        if (transformer.getDebug())
            transformer.getTraceManager().fireTraceEvent(this);

        int sourceNode = transformer.getXPathContext().getCurrentNode();
        if (DTM.NULL != sourceNode) {
            // supply the current templated (matched, not named)
            ElemTemplate matchTemplate = transformer.getMatchedTemplate();
            transformer.applyTemplateToNode(this, matchTemplate, sourceNode);
        } else  // if(null == sourceNode)
        {
            transformer.getMsgMgr().error(this,
                XSLTErrorResources.ER_NULL_SOURCENODE_APPLYIMPORTS);  //"sourceNode is null in xsl:apply-imports!");
        }
        if (transformer.getDebug())
            transformer.getTraceManager().fireTraceEndEvent(this);
    }

    /**
     * Add a child to the child list.
     * <!ELEMENT xsl:apply-imports EMPTY>
     *
     * @param newChild New element to append to this element's children list
     * @return null, xsl:apply-Imports cannot have children
     */
    public ElemTemplateElement appendChild(ElemTemplateElement newChild) {

        error(XSLTErrorResources.ER_CANNOT_ADD,
            new Object[]{newChild.getNodeName(),
                this.getNodeName()});  //"Can not add " +((ElemTemplateElement)newChild).m_elemName +

        //" to " + this.m_elemName);
        return null;
    }
}
